My girlfriend is my relative and sometimes families issues cause problems in our relationship too. How to stop it?

My mom cannot keep secret and spreads it. Sometimes it might be something from her family. Also her family have things that mine don't like.

She mostly bring these issues into our conversation, compare families and finally it becomes a fight between us.

How to stop this from happening?

My girlfriend is my relative and sometimes families issues cause problems in our relationship too. How to stop it?
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